Our most robust finding, invariably observed not only in our 3 batches but also in the
data of Ref. [1]}, is the logarithmic field dependence of the high-current single
crystal resistance \(R_{ab}\) . Although a power of \(H\)  factor is expected both
in \(\rho _{ab}\)  [2]} and \(\rho _{c}\)  [3]}, no such factor is
present in \(R_{ab}\propto \sqrt{\rho _{ab}\rho _{c}}\) . The most likely reason is
that the power-law factors in \(\rho _{ab}\)  and \(\rho _{c}\)  cancel
(exponents 3/4 and -3/4 in our analysis). The cancellation is very
accurate; we estimate that a power law factor with exponent as low as 0.1
could be observed in our \(R_{ab}\)  data.
Moreover, because we find no
logarithmic correction to \(\rho _{ab}\) , the logarithmic dependence of
\(R_{ab}\)  is carried by \(\rho _{c}\) .
